Lee, GJ Kim, DH Lee, JI Shim, HK Kim, YW Jo, JC 2024-01-21T20:12:19Z 2024-01-21T20:12:19Z 2022-01-10 1996-01 0021-4922 https://pubs.kist.re.kr/handle/201004/144836 The effect of alkoxy substitution on the photophysical properties of poly(p-phenylenevinylene) [PPV] was investigated using steady-state and time-resolved photoluminescence, visible and infrared absorption spectroscopies. By substituting the alkoxy group (methoxy or butoxy) into the phenylene ring of PPV, the prolongation of effective conjugation length accompanied by the disappearance of the well-resolved vibronic structure was detected in the absorption spectra. These experimental results were attributable to the electron donating effect and the steric hindrance of the alkoxy substituent. These conjectures were compared with the effect of the alkoxy substitution on the photoluminescence and the Fourier-transform infrared spectra. Also, it was found that, alkoxy substitution slowed down the exciton relaxation process from the lower exciton state to the ground state, and lowered the height of the potential barrier in an excitonic potential well. English JAPAN J APPLIED PHYSICS POLY(PARA-PHENYLENE VINYLENE) PHOTOLUMINESCENCE RELAXATION Effect of alkoxy substitution on photophysical properties of poly(p-phenylenevinylene) Article 10.1143/JJAP.35.114 1 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, v.35, no.1A, pp.114 - 119 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 35 1A 114 119 scie scopus A1996TU37000020 2-s2.0-0029753818 Physics, Applied Physics Article POLY(PARA-PHENYLENE VINYLENE) PHOTOLUMINESCENCE RELAXATION poly(p-phenylenevinylene) alkoxy substitution stretched film absorption photoluminescence fluorescence linewidth narrowing exciton lifetime steric hindrance